An engineer is testing the electrical properties of a newly synthesized thin-film semiconductor. The table below lists the current readings obtained during three independent trials when a constant potential difference of 15.0 V15.0\text{ V}15.0 V was applied across the film.
| Potential difference (V) | Current 1st reading (A) | Current 2nd reading (A) | Current 3rd reading (A) | Mean current (A) |
|---|---|---|---|---|
| 15.0 | 1.42 | 1.48 | 0.96 | ImI_mIm |
Calculate the mean current ImI_mIm.
39 exam-style questions on AQA GCSE Physics 2.1 Current, potential difference and resistance, covering 2.1.1 Standard circuit diagram symbols, 2.1.2 Electrical charge and current, 2.1.3 Current, resistance and potential difference, and 2.1.4 Resistors. Each one has a worked solution and a mark scheme showing where the marks go.